Electrical measuring instrument.



R. SHANE.

ELECTRICAL MEASURHlG INSTRUMENT.

APPm/u'sou mes Jun 7, 19:4.

1,23%1 1%., Patent-ed Aug. 7,1917.

Fig- I- Witnesses imverjtcr; f! w Rwbet IVIEASUZELIIG Application filed July 2", Eerie 1'50. @%9,-02.

T all whom it may comem: bemoan the deni iug vane thereby nm- Be it known that 1 ROBERT SHANE? a m terielly increasing I one damping Zen of the United States resid. W in minition i oronose to dose the non-adulcounty or mate or oen'rends or the our-rent eurryw eons 5 have invented certain new and u. ruler-eh the mugnetlzzible mem ers and the provelnents in Electrical Measuring dumping vane are positione n substanments, of which the "foilowing 1S a s fly closed ohznnber thus further increasfication. 31 {romping efi1e1ency.- This increase My invention relates to QiCCZl efficiency is an extremely deing instruments and especially io licet tine, particuiarly in a portable mu instruments particularly v nstrux'nent for use on alternating em nating current meesuremenis. Hits.

The object of my inntion nd improved duplex me a novel and improved dup measuring instrument, and t bumble novel and improved duplex ole uring instrument for use on rent circuits. More spew my invention is to prom ter and voitinei'e-r of the A furiher object of Le" mve' vide a duplex instrr rent cially efiicient damping on by the instrumeni is use on an alternating- 01 u objects of my inveniion from the following The novel for "u or I believe to be puteuiun cal-ted in the claims app:

construction and mode plex electricai measl bodyinfg the features f I; understood from the F taken in connection V:

drawings, in which Figure l is seerioir" and improved duplex in a top View in see'eo i e 4e merit; and 3 is an matio View of the e ieoene The duplex insmwne comprises two 21o cofile of the inciined co 4-5 an independent coupe a? memoer secu e-3. to as oo mounted The ii substence eomprises an i tor elemen on m qzolumeter eieinenhb hflViK hetiznble members sea common pivotaiiy moi ihe magnotizeoie memb 'the shaft, 1 place a dampin 05 manner that zhemu-gneiiiza in pivo ee ension 15 oi Hue fio'a've 7. re top coil 11.

i r .1 learner m, such 31 s v Snead a i ire so me members roof ne b'toxn a'jhe dampi e damping is mete oreesegi. An'end cap 18 surrounds e.

'vane arc positii'incd.

12 and closes the onen cud oil thc coil. 10. Another end cap 19 surrounds the shaft 12 and close" the open end of the coil 11. It will thus be soon that the end caps 18 and 19 form with. the insides of the coils and 11 a substantially closed chumbcr in which the mugnctizuhle members and the dumping The inclosing of tho damning vane in. a chamber of this character very inutcrially incrcuscs the dumping effect. f

An indicating member such as a. pointer 20 is secured to shaft 12 and sweeps across a su ishlc scale 21 graduated to reed in. umpcrcs and volts. The scale is supported by c bracket scoured to the base 5 and has 2i. slot behind which is positioned a. mirror 23 in the usual manner. A control spring 27 has one and secured to the shaft 12 and the other end secured to an adjusts able fixed arm 28. arm 28 is carried by the extension 15 of the bracket and is adapted to be adjusted so that thc tension of the. control spring can be suitably varied to bring the pointer to its zero position on the scale. A cover me ibcr 24* is seemed to the base 5 and incloscs l c opcrativc elements of the instrument. I .ss window 2%; is secured to the cover slim the scale 21.

The electrical connections 1e instrument will. be understood by rc 766136 3 to Fig. 3 of thc drawings. The coil id is a voltmeter coil and has connected in series thercwith a resistance 29 of the usuol character. The coil is ill ustretcd, in the figure as con nectcd directly across the conductors 30 of an electrical installation. A. switch 81 serves to clcctrically disconnect tho coil at will. The

coil 11 is an ulninctcr coil and is adapted tobc connected in series with one of the conductors 30., A switch 32 arranged in shunt to the ummetcr coil 11 so that when the switch is in. the position indicated in the drawings the animator coil. is short circuitcd and no current flows therein. it will be ob served from Fig. of the drawings that the volt-meter and ninmetcr coils have indepcndcnt terminals. Thus the voltmeter coil 10 has two iudcpcndcnt terminals indicated by V, while the :n'nmeier coil 11 has two independent terminals indicated by A. The

-'-.'oltinoter and sminctcrtcrzninals are as far apart as possible on opposite sides of the base 5.

The operation of the instrument will be evident to those skilled in the art from the foregoing dc ption. filince the ammcter coil and the voltmeter coil have independent terminals the instrument can be perma-v nently connected to an installation indicated in Fig. 3 of the drawings. With the connections represented, the instrument will indicate the voltage between the conductors 30 of the installation. It will be obvious that the voltmeter coil 10 and its co- "as an ordinary inclined coil cmmctcr.

operating mugnctizuble member 15 act as on ordinary inclined coil. voltmeter. Due, however, to the construction which I am enabled to use in the duplex instrument the damping is very materially increased so that the instrument is peculiarly adapted. for 1118218111 ing alternating current voltages. If it is desired to use the instrument as an animator, the switch 31 is opened, and then the switch 32 "opened. The opening of the switch 31 disconnects the voltmeter coil while the opening of the switch 82 includes the ammctcr coil in series with one of the conductors 30. The unimctcr coil 11 and its cooperating msgnctizable member 15 now set It will thusbe evident that I huvcprovided a, very compact construction of duplex measuring instrumcntwhich is adapted to measure both, amperes and volts without any L closed herein by Way of example for the pun pose of setting forth my invention in accordance with the patent statutes. The terms of the appended claims are, therefore, not restricted to the precise structure disclosed but are intended to cover all changes and modifications within the spirit and scope of my invention.

What "i claim as new and desire to secure by Letters lfotcnt of thc'Unitcd States, is

1. An electrical measuring instrument comprisinge piirotally mounted shaft, two

- adjacent currentccrrying coils surrounding said shaft. each of said coils being arranged in an inclined position with respect to the shaft, an independent magnetizablc membcr for each coil mounted on said shaft, a dumping vane secured to said shalt between said magnctizable members, means ior closing the non-adjacent ends of the coils whereby the magnetizsblc members and the damping; wine are positioned in a. substantially closed chamber. and an indicating member operatively rcleicd to said shaft.

2. A duplex electrical measuring instrument comprising a stationaiy ammetcr coil and a stationary voltmeter coil each of the inclined coil type, a pivotally mounted shaft operatively common to both coils, an independlent mugnctizable member for each coil mounted. on said shaft, a. damping vane 89/- cured to said shaft between said umgnctizable members, means for closing one end of each coil whereby a substantially closed chamber is formed inclosing sold magnetizablc mcmhcrscnd said damping vane, indemeans pendent terminals for each of said coils, and an indicating member operatively related to said shaft.

3. An electrical measuring instrument comprising a pivotally mounted shaft, two

adjacent current carrying coils surrounding said shaft, each of said coils being arranged in an inclined position with respect to the shaft, an independent magnetizable member operatively related to said shaft.

1. An electrical measuring instrument comprising a pivotally mounted shaft, a current carrying coil surrounding said shaft and arranged in an inclined position with. respect to the axis of the shaft, a second current carrying coil surrounding said shaft directly adjacent the first coil and arranged above the first coil so that every portion of the second coil is directly above the corresponding portion of the first coil, an independent magnetizable member for each coil mounted on said shaft, a damping vane secured to the shaft between said members, end caps surrounding said shaft and closing the non-adjacent ends of the coils whereby the magnetizable members and the damping vane are positioned .in a substantially closed chamber, a control spring for said shaft, and an indicating member operatively related to the shaft.

5. An electrical measuring instrument comprising a pivotally mounted shaft, a current carrying ammeter coil surrounding said shaft and arranged in an inclined position with respect to the shaft, a current carrying voltmeter coil surrounding said shaft and similarly arranged in an inclined position with respect to the shaft, said coils being arranged one above the other With their adjacent coil sides mechanically in contact and so that every portion of the top coil is directly above the corresponding portion of the bottom coil, two magnetizable members carried by said shaft and arranged in parallel planes inclined to the axis of the shaft, one ofsaid magnetizable members being 0peratively positioned Within the magnetic influence of the ammeter coil and the other magnetizable member being operatively positioned Within the magnetic influence of the voltmeter coil, an air damping vane secured to said shaft between said magnetizable members, and an indicating member operatively related to said shaft.

6. An electrical measuring instrument comprising a pivotally mounted shaft, a

current carrying ammeter coil surrounding said shaft and arranged in an inclined position with respect to the shaft, a current car rying voltmeter coil surrounding said shaft adjacent to said ammeter coil and similarly arranged in an inclined position with respect to the shaft, two magnetizable members carried by said shaftand arranged in parallel planes inclined to the axis of the shaft, one of said magnetizable members being operatively positioned within the magnetic influence of the ammeter coil and the other magnetizable member being operatively positioned Within the magnetic infll1 ence of the voltmeter coil, a damping vane secured to said shaft between said-magnetizable members, two end caps surrounding said shaft and adapted to close the non-adjacent ends of said coils whereby a substantially closed chamber is formed inclosing said ma ROBERT SHAND. Witnesses 'JoHN A. McMANus, Jr.,

JOHN T. BEEOHLYN. 

